These 10 color Tombow Dual Brush Pen Sets are ideal for fine art, illustration, hand lettering, and more. Each pen features a brush tip that works like a paintbrush to create fine, medium, or bold strokes. The brush tip has a nylon base that retains its point stroke after stroke. The other end features a fine tip that gives consistent lines for sharp details. With either end of the pen, introduce some water to your paper for a wonderful watercolor effect.